In the thermodynamic relation pV = nRT, the term ‘n’ is

Concept:

A hypothetical gas that obeys the law PV = nR̅T at all pressures and temperatures is called Ideal gas. 

There are two equations for Ideal Gas.

1. PV = nR̅T
2. PV = mRT, P = ρRT

where,

P = Absolute pressure (Pa), V = Volume (m3), n = Number of moles of the gas \( = \frac{{\bf{m}}}{{\bf{M}}}\), \({\bar{R}} = \;\)Universal gas constant (8314 J/kg-mol.K), \(R = \rm characteristic\;gas\;constant = \frac{{\bar R}}{M}\;\left( {\frac{J}{{kg.K}}} \right)\;\;\), T = Absolute Temperature (K), M = Molecular weight of the gas, m = Mass of gas (kg) & ρ = Density of gas (kg/m3).